Truing square stock in a 4 jaw independent chuck?

[cobra428]

Hi Guys,
I don't remember where I read it but it seemed like an easy way to work with a 4 jaw. You use round stock of the same dia as the square. Adjust chuck with DI till well centered. Loosen two jaws (90deg apart) place in square stock and tighten the two jaws you loosened previous. Now your really in the ball park. This works great for small stock. If your up there in size......DI the four sides.

Tony

 

[Majorstrain]

Gee I'm a dropkick *bang*, I used Rick's method and got the indicated run out down tho less than 0.005mm ( 0.2 of a thou) on 6mm square. ;D

There is the simple old method.
The indicator tip needs to be as close to on center as possible.
With the tip against one flat rock the chuck back and forth to find
the low spot and zero out the indicator. Pull the needle back to clear
the piece and rotate it 180° Lower the tip to that flat and again
rock the chuck back and forth to find the low spot.
If you indicate to the 4 sides low spots the stock will be centered.
If the stock is too big to clear the indicator needle by puling it back,
mount the indicator on the cross slide and move it back out of the way
to rotate to the opposite side.

Rick

Then I did a trial cut to check. th_wtf1 The cut was miles out, what went wrong :shrug: The needle was smack on zero for both sides.

If I'd bothered to read the smaller needles I would have noted I was a full millimeter out. oh:

Thanks Rick, the method works great and it's fast too.


Cheers
Phil